Robotic-assisted surgical procedures have fallen off steeply as the ongoing global pandemic has unfolded, but the real impact on Intuitive Surgical Inc. will come as its hospital customers may have to limit orders for expensive equipment upgrades as they struggle to manage unprecedented financial burdens. The U.S. accounts for about 70% of its robotic surgery procedures, but by the last few weeks in March, that activity had been curtailed by roughly two-thirds.